died in 2010. william lajeunesse with the news live tonight in los angeles. william? >> bill, naco is a small, quiet border town until the sun goes down. for years it was the single busiest spot on the border and today it remain has major drug highway. early this morning, around 2:00 o'clock in the morning, three agents responded when a sensor or typically go off in a given area suggesting a line of illegals or smugglers were coming up a canyon. when agents arrived, gunmen opened fire, an apparent ambush. was was air lifted to tucson medical center in stable condition. another was patrolling on horseback, he was killed. 30-year-old nicholas ivy was born and raised in utah, joined the border patrol four years ago. he leaves behind a wife and two daughters. >> it's been a long day for us, but it's been longer for no one more than a wife whose husband is not coming home. >> the naco station covers about 1200 square miles, including 32 miles of arizona-mexican border. the fear is that the suspects reportedly up to four, made it across the border before this dragnet got fully underway.